Debugging and developing Defold Android through ufw firewall

iotaHum · October 29, 2023, 10:34am

I am learning how to run and debug from Ubuntu 22 to Android;
I have it generally working, although I guess I have many unknowns to work through.

To make it work I have turned off the firewall. I think it would be good to keep the firewall on.
Each time I run a session, adb logcat, reports a different port in use, is there a way to make this consistent so I can set a port (or range?) in ufw?
What is best practice here? Is this something I need to do in Defold or adb?
What should I go and read? Maybe it all in the Defold docs and I just need to read more slowly:-)
edited:layout:-)

britzl · October 29, 2023, 10:54am

The way ports are set up is documented here:

github.com

defold/defold/blob/dev/engine/docs/DEBUG_PORTS_AND_SERVICES.md#engine-services-and-ports

# Engine services and ports

It is possible to connect to and interact with a debug version of the engine through a number of different open TCP ports and services. The following services and ports are typically available in a debug build of the engine:

* SSDP - Port 1900.
* Engine service - Port 8001 or the port specified in `DM_SERVICE_PORT` environment variable. When running from the editor `DM_SERVICE_PORT` is set to “dynamic” which means that the engine will let the OS assign a random available port.
* Redirect service - Port 8002. 
* Log service - Port assigned by OS. 
* Remotery - Port 17815.


## SSDP
SSDP ([Simple Service Discovery Protocol](https://en.wikipedia.org/wiki/Simple_Service_Discovery_Protocol)) is used by the running engine to [broadcast](https://github.com/defold/defold/blob/dev/engine/dlib/src/dlib/ssdp.cpp) its existence on the network so that the editor can [discover](https://github.com/defold/defold/blob/dev/editor/src/java/com/dynamo/upnp/SSDP.java) it and connect to issue commands.

<details><summary>Example of a client in JavaScript</summary><p>

Using npm package [node-ssdp](https://www.npmjs.com/package/node-ssdp)

```js
const Client = require('node-ssdp').Client;

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As you can see the editor always sets the port to “dynamic”. It is done in engine.clj:

github.com

defold/defold/blob/dev/editor/src/clj/editor/engine.clj#L266

    
      
                                     (File.)
                                     (.getAbsolutePath))
              command (.getAbsolutePath engine)
              args (cond-> []
                     defold-log-dir
                     (into ["--config=project.write_log=1"
                            (format "--config=project.log_dir=%s" defold-log-dir)])
          
          
           debug?
                     (into ["--config=bootstrap.debug_init_script=/_defold/debugger/start.luac"]))
              env {"DM_SERVICE_PORT" "dynamic"
                   "DM_QUIT_ON_ESC" (if (prefs/get-prefs prefs "general-quit-on-esc" false)
                                      "1" "0")
                   ;; Windows only. Sets the correct symbol search path, since we're also setting the cwd (https://docs.microsoft.com/en-us/windows/win32/debug/symbol-paths)
                   "_NT_ALT_SYMBOL_PATH" (.getAbsolutePath (.getParentFile engine))
                   "MESA_GL_VERSION_OVERRIDE" nil
                   "MESA_LOADER_DRIVER_OVERRIDE" nil}
              opts {:dir project-directory
                    :err :stdout
                    :env env}]
          ;; Closing "is" seems to cause any dmengine output to stdout/err

One improvements could be for the editor to check if DM_SERVICE_PORT is set and then use that value instead of always setting it to “dynamic”.

iotaHum · October 29, 2023, 11:09am

Thanks for the reply. I think I will have to keep the firewall off while I debug as I don’t understand enough to ask sensible questions:-)
I will go back to trying to understand why the camera does not work in defold-gyro, but does in extension-camera (I though I should try to work this out for myself rather than being lazy and asking).